that does it for welcome to "world news." tonight, inside the capture. the extraordinary, new police video. stun grenades lobbedt boston marathon suspect right before his arrest. and tonight, he is answering prosecutors' questions for the first time. and we are at the bedside with one brave victim. and the man who saved her. avalanche. a snowboarding adventure turns deadly when the mountain gives way. what makes this season so dangerous? reefer madness. mass panic at the marijuana festival. will the violence set back the movement to legalize? and strong language. what the red sox star, big papi, told the people of boston. we cannot put it on the air. but it has become an improbable rallying cry.

good evening. thanks for joining us on this busy sunday. tonight for the first time, the suspect in the boston marathon bombing is awake and answering questions. 19-year-old dzhokar tsaranev is in the hospital. in serious but stable condition. but law enforcement officials say he is responding to some questions in writing. they especially want to know if there is an imminent threat out there from others he may have worked with or from unexploded bombs. all day, we've been watching these riveting images behind me. this is infrared video shot from a helicopter. it shows stun grenades lobbed into the boat where the suspect was hiding right before he was taken. martha raddatz has the story. >> reporter: the video images show the dramatic end to the manhunt more clearly than anything we have seen.

the police helicopter hovers in the darkness, holding steady. the natural heat from the suspect's body, making a near-perfect outline through thermal imaging, despite t tarp that covers him. he is lying on his back. his head to the right, feet to the left. then, a flash, a bang. police toss a stun grenade, meant to confuse the suspect. then, another. followed by a third. and then, watch. at first, motionless. we see for the first time video as the 19-year-old raises his head, his upper body. >> quite a bit of movement. >> reporter: on the ground, dozens of negotiators watching from the second floor of a house nearby, urging the suspect to give up. a robot moves in to peel away the tarp. >> looks like he will successfully rip that off, he

will be exposed. >> reporter: he has no place to hide. >> he was slow. and lethargic. what's in that boat? was it more explosive devices? >> reporter: moments later, he is on the ground, handcuffed and receiving medical treatment. >> there was a lot of relief. we were very concerned stha they wanted to go out and kill more people. to know we had him in custody was an incredible feeling. >> reporter: one key break in capturing the suspects came from a cell phone. the man whose suv they carjacked left his cell phone in the car. and tracking that phone is what led the police to watertown and that deadly firefight with the two brothers before the younger one took off. dan? >> extraordinary images. captivating story. martha, thank you. the capture is, of course, behind us. but the investigation now barrels forward. today, the suspect starting to communicate with police. as investigators dive deeper into his past and the strange odyssey of his older brother.

abc's chief investigative ston once again tonight.s, is in brian, good evening. >> reporter: good evening, dan. federal authorities put off plans to file formal criminal charges today. they'll likely do it tomorrow. meanwhile, at the hospital, 19-year-old dzhokar tsaranev is occasionally awake and communicating to federal authorities through writing. officials say the evidence against tsaranev in the bombings is overwhelming. authorities say this photo shows him in the white cap, about to place his bomb near 8-year-old martin richard, who was killed. and his 7-year-old sister, jane, who was seriously injured. also nearby, the two norden brothers, each of whom lost a leg in the blast. >> there's no explaining the savagery involved here. there's no explanation for it. >> reporter: it's been almost two, full days since tsaranev was captured from his hiding place in the boat. federal agents have begun to question him about other

accomplices or explosive devices. they're communicating with him in writing due to injuries to his throat, that could have been self-inflected. >> it's questionable whether -- when and whether he'll be able to talk again. >> reporter: the wider investigation into motive centers on the dead brother. 26-year-old tamerlan, who had recently began to link to jihadist videos. >> he brainwashed his younger brother. from there, what happened on marathon day. >> reporter: tamerlan was reportedly a changed man, and began to link to the videos, after a six-month trip last year to russia and chechnya. chechen rebel groups, known for their fierce attacks on russian targets, have denied any connection to the boston bombings. authorities are pointing to a statement made several years ago, in which a rebel leader said, our enemy is not only russia, but also america, britain and israel. in a letter to the fbi today,

the chairman of the house homeland security committee suggested an intelligence failure. and questioned why the fbi failed to keep tamerlan on its radar of questioning him about possible terror ties two years ago at the request of russia. >> i give him the benefit of the doubt. but he was on the radar screen. and somehow he got off the radar screen and traveled overseas to one of the dangerous parts of the world. >> reporter: once federal charges are filed, authorities say they're likely to include counts that ask for the death penalty. although, the final decision whether whether to seek the death penalty will be up to attorney general eric holder. dan? >> from your sources, from what they've told you, do they think there's an imminent threat still out there? >> reporter: at this point, no one really thinks there's an imminent threat. they believe those two probably acted alone and that the explosive devices are been accounted for. but as they begin to ask questions with the suspect in the hospital, they expect to get more answers in the coming days. >> brian, thank you. for more on the legal case

against dzhokar tsaranev, we're going to turn to michael garcia, who was the prosecutor in the 1993 world trade center bombings and the embassy bombings in africa in 1998. michael, thanks for joining us. after the charges are filed, what happens next? >> things move very quickly. there's a certain period of time, days, not weeks, that this suspect will have to be brought before a judge. once that happens, it will change the dynamic of how agents, how law enforcement can question him. >> there's all this talk about the public safety exception, which means the investigators don't need to read him his rights. why is that so important? >> important because you want to know, is there a ticking time bomb out there? is there a loaded gun? are there unstable chemicals? so, to protect the public, you need to know where these things may be. >> does it matter whether they read him his rights or not? isn't he likely to cooperate or not? >> more likely to get a quick response off the cuff. you can ask the question, where is your bombs? where are you keeping

explosives? whether did you drop the gun? rather you walk through a miranda warning, someone has a chance to step back, what's this about an attorney? what's this about a right to remain silence? you need to protect the public. you need that information. >> do you believe that young man h y to facthat pelt >> given the nathese crimes, i would say the answer to that is yes. >> the city of boston is angry, justifiably. and that anger is unlikely to dissipate very quickly. so, can he get a fair trial in that city? >> very difficult to move a trial. the legal standard essentially no jury in this city will be able to look fairly on this evidence. very high standard. i believe he will face trial in boston. >> michael garcia, thank you. appreciate it. >> thank you. as investigators peer deeply into the lives of the bombing suspect, they will look at what happened in a remote and dangerous part of russia, visited not long ago by the older brother. he apparently came back a changed man. and abc's kirit radia is there

tonight. >> reporter: last year, tamerlan traveled here, to dagestan, a region home to an islamist uprising. investigators want to know if it was during that trip he became radicalized. but family we saw today, said there were no signs of extremism. there's no feeling he could be, his aunt said. she showed us photos of the suspects as young boys. they were very kind boys, she said. tamerlan came here to renew his passport. the aunt said he stayed to train as a boxer. they say tamerlan prayed in the city's central mosque on friday. but denied they fought over religion. we were debating with him, she says. but not fighting. tamerlan spent six months in dagestan. relatives say he visited chechnya, also home to islamist militants three times, to visit family and choosing to fly home from the chechen capital.

younger brother, dzhokar, was going to visit in may. his father is praying for him to survive. so he can tell us what really happened, he said. kirit radia, abc news, dagestan. the younger brother, the surviving suspect, is being treated in the same hospaln bost a of the bombing victims themselves. tonight, 52 of the injured are still in hospitals around the city of boston. let's not let their stories be overshadowed. here's abc's gio benitez. >> reporter: heroism captured in a photo. a man carrying a wounded woman moments after the marathon bombing. this is them today. caitlin case tells us her story from her hospital room. the friend who saved her life, leo, at her bedside. when you look at that incredible picture, of him carrying you away, what goes through your mind?

>> god had angels watching me that day. >> reporter: caitlin was watching the marathon monday, from the finish line when her world changed. leo was right there. >> the first explosion went off, we went to the gunand he jumped told me to stay down in case there were anymore explosives. and then, he picked me up and carried me to where his car is. tied a blanket and his shirt around my leg to stop the bleeding. >> my instinct was to pick her up. >> reporter: leo rushed caitlin to the hospital. that quick thinking saved her life and leg. she is 1 of more than 170 people injured that day. while there were more than 20 in critical condition, today there are only 3 people left on that critical list. this morning, cardinal sean o'malley had a mass to honor those that died. just as the friends and family of one of them, krystle campbell, said their final good-byes. and hundreds gathered on the street to mourn the death of

m.i.t. officer sean collier, killed just before thursday night's shoot-out. meanwhile, back here at the hospital, caitlin tells me she's doing so much better. in fact, dan, she says, she pes hospital in the next few days. >> that will be great to see. gio, thank you. that's our coverage of the boston marathon bombing for tonight. now, we turn to texas. where we're learning that the first responders who rushed in to put out the massive fire at the fertilizer plant in the small town of west, they paid a staggering price. much higher than we initially thought. abc's steve osunsami is there tonight. >> reporter: today outside that massive explosion site at that texas fertilizer plant, the local sheriff told us that the first responders who died didn't have a chance. 14 people were killed. and authorities say 12 of them were firefighters and paramedics and other workers who were there trying to put out the initial fire that may have caused the

explosion. >> our priority today is the line of duty death investigation for the firefighters and first responders who lost their lives in this incident >> reporter: it's one of the greatest losses of first responders since the 2007 charleston sofa factory fire that killed nine. in texas today, some families were allowed home. >> i just wanted to come home. i wanted to see my house. >> reporter: mary necker says her house is broken. but she is not. >> that can all be fixed. it's going to take a little while. but it can be fixed. >> reporter: homeowners who they are letting in now, live far away from the plant that exploded. it is several streets, several city blocks that way. they're worried about broken gas pipes or pipes connected to the plant, causing another deadly blast. steve osunsami, abc news, west, texas. >> steve osunsami, thank you. coming up here on "world news" this sunday, high anxiety. mayhem and gunfire. the first big celebration of legalized weed in colorado.

what will this do to the efforts to make pot legal in other states?>>and buseof experienced snowboarders set off an avalanche. and why this is happening more frequently this year. i stepped on the machine, and it showed me the pressure points on my feet and exactly where i needed more support.

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>> reporter: the gunshots turned one of the country's largest pot rallies into a place of panic. and thousands who came to celebrate marijuana in denver, forced to run for cover. >> i was right up next to the barricades.everybody started ru smashing into me. >> reporter: witnessesay as many as ten three . police are now searching for two suspects butaywhatered the viol. the event marked the annual 4/20 counter culture hoy. this was the first since colorado and washingn legalized the recreational use of marijuana. the shooting comes at a sensitive time, as colorado lawmakers grapple with how to regulate and enforce use. recreational use remains illegal under federal law. the question, now, will the large crowds this weekend stall the movement to legalize marijuana? >> are they willing to pay the price for those experiments, with regard to have so many

folks coming in from out of state? are they willing to regulate those folks the same way they regulate they're own citizens? or in this case, to not regulate them. >> reporter: something other states and marijuana supporters will be watching closely. akiko fujita, abc news, los angeles. and coming up, breaking point in the rocky mountains. the harrowing tale of men who survived a massive avalanche that killed five of his friends. and what is so dangerous about this year in particular? and i honestly didn't think i would ever quit. [ male announcer ] along with support, chantix (varenicline) is proven to help people quit smoking. it reduces the urge to smoke. it put me at ease that you could smoke on the first week. [ male announcer ] some people had changes in behavior, thinking or mood, hostility, agitation, depressed mood and suicidal thoughts or actions while taking or after stopping chantix. if you notice any of these stop taking chantix and call your doctor right away. tell your doctor about any history of depression or other mental health problems, which could get worse while taking chantix. don't take chantix if you've had a serious allergic

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america's heartland is waterlogged tonight. several rivers including the mississippi and the missouri are cresting right now. in clarksville, missouri, days of sandbagging was no match for the mighty mississippi. hundreds of thousands of acres of farmland were swamped, roads flooded. at least two people were killed. the river, so swollen after drenching rains, more than 100 barges broke loose near st. louis. some of them may have even sank. it happened in a flash. a deadly avalanche in the colorado rocky mountains. a group of snowboarders buried alive. five of them died. only one survivor. to thrill-seekers, the back country slopes are irresistible. but this year, they are dangerously unstable. abc's clayton sandell explains. >> reporter: it is colorado's worst avalanche disaster in 50 years. on saturday, six snowboarders ventured into an out-of-bound zone near loveland ski area, about 60 miles west of denver.

authorities say the men accidentally triggered an avalanche, two football fields wide and four football fields long. >> i called the coroner's office, saying get ready. it looks like it's going to be >>sn reporowbors killed, buried least eight feet of snow. all were in their 30s, including rick gaukel, an experienced avalanche expert and a member of an organization dedicated to avalanche safety. only jerome boulay made it out alive and unhurt, managing to flag down a car and call for help. this latest deadly incident the brings the number of people killed by avalanche this season to 24. forecasters warned of a dangerous potential for avalanche on saturday. but officials say the men had the right safety gear and knew how to make good decisions. but with unstable snowpack, some of the worst conditions in 30 years, none of that mattered when the mountain gave way. clayton sandell, abc news, denver. >> a disaster in colorado tonight. thank you, clayton. up next, we switch gears. they are calling it the

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finally tonight, one of the many charms of boston, which happens to be my hometown, so i'm a little biased here. is that when we bostonians get emotional, we sometimes use words that are less than polite. case in point, a guy named big papi. that's his nickname. his real name is david ortiz. he is the biggest baseball player in boston. and at a public ceremony on the field in fenway, he uttered what is now being called the expletive heard around the world. it was a solemn moment. boston was coming together. exhaling communally. ♪ and every breath we drew >> reporter: honoring the victims, saluting the first responders, singing the national anthem. and then, big papi, david ortiz, the designated hitter and first baseman, stepped to the mic for an inspirational message. >> this jersey we wear today, it doesn't say red sox.

it says boston. >> reporter: that's when we learned that big papi has a big potty mouth. >> [ bleep ]. >> this is our [ bleep ] city. and nobody's going to dictate our freedom. stay strong. thank you. >> reporter: the crowd of bostonians, a group of people who, let's be honest, know their way around an f-bomb, ate it up. but here's the problem. not only there were kids in the house. but this ceremony was being aired live on cable. >> really, really [ bleep ] brilliant. >> reporter: the fcc has frowned on things like bono cursing on the golden globes on nbc. but not an hour after big papi's slip of the tongue, no less than the fcc chairman himself, tweeted out, david ortiz spoke from the heart at today's red sox game. i stand with big papi and the people of boston. the fcc's indecency rules only apply to broadcasters, not cable.

so, it's not clear whether this has reflected any change or thi. big papi's speech has become a rallying cry in a wounded but still strong city. they're already selling t-shirts. all right selling t-shirts. the red sox won the game. big papi went two for four with one rbi. that's going on the do it on "world news" this sunday. before we let you go, we want to tell you about diane sawyer's exclusive interview this week. she's going to sit down with former president bush and laura bush on the eve of the opening of the new presidential library at southern methodist university. mrs. bush will give diane a behind-the-scenes tour. and diane will anchor "world news" from the library wednesday night. "gma" is back tomorrow morning. and diane will be back in this chair tomorrow night. for david muir and all of us here at abc news, i'm dan harris. thank you for watching. and have a great night.

next at 6:00, new details tonight on the suspect in the boston bombings. what changed this afternoon that has led to some communication with police. plus, golden gate park trarchlt what happened that left this garbage piled up. live doppler 7hd is clear but changes are ahead. the big warmup and what is ahead at for your work week. abc7 news at 6:00 starts now. things are heating up across the bay area. lots of people headed outside to enjoy the warm weather, as well they should taking a live look outside, right now, you can see the gorgeous blue sky, still clear and very sunny.

good evening, i'm in for ama daetz who is on assignment in boston. we want to get right to abc7 meteorologist leigh glaser for a look at the heat. any records today? >> leigh: no records today but turning to live doppler 7hd and you can see no returns. we're in a very dry weather pattern, and would you take a look at the highs for today. no records, although very toasty. santa rosa, 87. 81 in oakland. livermore, 89. san jose, 84. these numbers well above where we should be. check out the 24-hour change. up ten degrees from this time yesterday in santa rosa. up 11 at sfo. and we could have some record highs tomorrow. i'll show you which areas could see these records. >> turning now to boston,